Bool approved : If GSUser is pre-approved or not
Bool isFirstTransactionOfUser : If user has already done transactions previously or not
String/NSString buttonText : The text to display on Simpl button. If GSUser is pre-approved,this will contain a value specific to merchant with default value of "Buy Now, Pay Later". Will be nil if GSUser is not pre-approved.
NSError error : Error if any

If the user is approved and merchant should show Simpl button and if the user is not an approved user,do not show the Simpl button.

To show Simpl option, merchants can use their own custom button. However they should use buttonText value from approval call above to display the text on the button.

On clicking Simpl button, call the following method to start the transaction. This will open an OTP view for the user to enter . In the completion block transaction_token will be returned.